Punch-cutting and matrix-cutting machine.



I. H. PIERPONT.

PUNGH CUTTING AND MATRIX CUTTING MACHINE.

APPLICATION FILED JULY 17, 1906. Oct. 26

12 BHEETB-BHEET 1.

M M W A flmym s 919i hieooea F. H. PIERPONT. I

PUNCH CUTTING AND MATRIX CUTTING MACHINE. I

APPLICATION FILED JULY 17, 1906.

938,074, Patented Oct. 26, 1909.

. 12 SHEETS-SHEET 2.

i fM W RH. PIERPONT.

PUNCH CUTTING AND MATRIX CUTTING MACHINE.

APPLICATION FILED JULY 17, 1906. 938,074. Patented Oct. 26,1909.

12 SHEETS-SHEET 3.

z .m H a v M ad ll L wit" ease-o P. H. PIERPONT.

I UNOH OUTTINQ AND MATRIX .OUTTING MACHINE.

APPLIOATION FILED JULY 17, 1906.

Patented Oct. 26, 1909.

12 sums-slum 4.

awventoz ZQJ /4;M'M W attoznugs I. H. PIERPONT. PUNCH CUTTING AND MATRIX CUTTING MACHINE.

9 0 9 l 6 2 MW 0 d w m a P 12 SHEETS-SHEET e.

; attozneqs F. H. PIERPONT.

PUNCH CUTTING AND MATRIX CUTTING MACHINE.

APPLICATION FILED J'IL'ILY 17, 1906.

Patented Oct. 26, 1909.

12 SHEETS-SHEET 7.

Snoenl'oz I F. H. PIERPONT. PUNCH CUTTING AND MATRIX CUTTING MACHINE.

APPLICATION FILED JULY 17, 1906.

Patented 0ct.26, 1909.

12 SHEETS-SHEET 8.

mun 48 I atto'uuu s 23% in eases F. H. PIERPONT. PUNCH CUTTING AND MATRIX CUTTING MACHINE.

. APPLICATION FILED JULY 17, 1906. 938,074. PatentedOct. 26, 1909.

12 SHEETS-SHEET 9.

Q Vi ha eases F. H. PIERPONT.

PUNCH CUTTING AND MATRIX CUTTING MACHINE.

APPLICATION FILED JULY 17, 1906.

Patented Oct. 26, 1909.

12 SHEETS-SHEET 10.

glvwentoz QM ha cases F.- H. PIERPONT.

PUNGH CUTTING- AND MATRIX CUTTING MAGHINR APPLIdATION FILED JULY 17, 1906. 938,074:

Patented Oct-26,1909.

12 SHEETS-SHEET 11'.-

Q 2 Q M 3 Q 3 k S Q Q R M R Q Q W: gm n b uventoz Wi in Man F. H. PIERPONT. PUNCH CUTTING AND MATRIX GUTTINGMAGHINE.

APPLICATION FILED JULY 17, 1906. I

' Patented Oct. 26, 1909.

12 SHEETS-SHEET 12.

| g 'gF-"r snoent'o'a wammm [k UNITED STATES PATENT OFFICE rmx airman rmnronr, ornoannx, ENcLAND, ASSIGNORTO 'LA'iISTON monorrrn MACHINE comrm, or PHILADELPHIA, PENNSYLVAN A," 1a? ooarom'rro'n or To all whom may 06mm Be .it known that I, FRANK l-ImMan Pran- PONT, a citizen of the United States, tem

porarily residing at Horley, in thecounty qf.v y, England, do hereby declare thatIf's have made a new and useful Improvementin or Relating. to Punch-Cuttin Cutting Machines; and I do ereby declare the following to be a full, clear, and exact 10 description of the same, reference. being had to the accompanying. drawings, forming a part of this specification, and to the fi ur and letters of. reference marke'd thereon.

This invention relates tomachines for reproducing in" cameo or in intaglio patterndesigns'and more particularly to machines of this class for cutting type, type punches,

- 'matrices and the like where extreme accuracy 1 in proportion, location and form are essen- I zo tial requisites, although many features of 'the invention may be otherwise utilized.

Heretofore the cutting of type punches and matrices has been regarded as an art de manding the exercise of. thehighest dfiflgfi y of mechanicalskill even when practice the aid of the most approved forms of mechanism to be foundinthe market.- This is due in a large measure to the extreme degree of accuracy demanded, the measurements' running mto ten-thousandths of an inch and less, and to latent and patent inaccuracies in the mechanism employed to effect the reproduction, necessitatmg frequent inspections and measurements of the product during development and the readjustment of the workingtpartsto, correct observed inaccuracies orjcompensate for known deficiencies, the latter fusually ycharted and allowed for in setting I the adjusting devices. Not

40 only is, a high {degree 5- ofqskill requiredin making these observations and reflecting cor- ,rective and other adjustments but -much l valuable time is lost; gtherebyv r not infreiquently exceeding; 250% :of the time actually consumed cutting the punch, resulting not 1 only: in increased costabut a: corresponding reduction in output. v

' Now one; ofggthe {principal objects-of- ,i the pr s n n en i 0n;=- and; one whi h as-bee f successfully. .;demonstratedpractice? (is the elimination ofj latent a n correction: of, patent error i n-the 'i'n h maitsel-fi ,tosueh an :ext 'nt t at am mateurior unskilled operator .Q-fkaverag n el g ncest ve hy i he aid. of said machine not o lyrproduce aecu ate and;

Tothis end the invention consists inthe tionsjand more or less loose joints; insuring spective of'the degree-of reduction for which imembers corresponding with a predeterthe cut controlling adjusting ,devic'esl'lfrom PUNCH-CUTTING AND MATRIX-CUTTING MACHINEJ I 1 Specification of ietterslatent; Patentd Oct, 26,1909, Applicationfiled m 17 1eoe. Serial in. 325,671;

' perfectpunches and matrices equal or superior in all respects to those heretofore produced by skilled labor; butata rate far in excess ofthat heretofore attained. j

. construction. combination and arran ement of parts hereinafter described inc uding, among others, the following novel features,

to wit :"the employment ofaspherical joint located in the cutting axis of the machine for transmitting; motion "from -;-the pantographv L or n agjng1ever tothe work or tool support in a' predetermined ratio and without undue displacement arising from multiple connecthe correctlocation of the atterns with re-. lation' to the cutting axis 0 themachine by providing each pattern With an index or notch in predetermined relation, to one side of the character borne thereby and'the bed plate or platen with interchangeable gaging members for maintaining a constantmargin alongone side of each punch or matrix irrew the machine is set; providing the cut conso trolling devices with an index plate and a raduated series of followers oridisks, said index plate carryingfa (graduated series of notches orequivalent mechanical locating mined ratio of reduction, each locating memher being numbered or otherwise marked to indicate the corres onding follower (there being a separate in ex late and corresponding series of followers or diflerent ratios of reduction) ,whereby precise adjustments can be quickly and accurately-effected, thereby dispensing. with charts and eliminating ;a prolific source OfPGISOIIRla error; insulating the cutter and blank,. asv.by locating them at a remote-point and employing. knife edge or equivalent line or: point transmlsslon pontacts, so that the heat generated inthecutting operation will, not bestransmitted to ,and causedto efi'ec t the accuracy of. the: ada ustments insulating the, bearing for, driver o -:P 11 y from, a. ,7 and its support so that the .heat generated the cuttencarry ng spindle y? e ei ra wi l me transmitted eto 7 and efiet; said spindle, its

vices"; advancing the cutter relative the w rk; owl-ask; byv ,sp i apr u e nd .l

the advance e amma a etermine the depth of cut; retaining the removable cutter carrying quill in its bear ng and the tool holder in its spindle by spring pressure, thereby preventing distortion due to varying pressures produced when pos1-- tive clamping devices are employed as wellas permitting expansion in a direction away from the cutting axis of the machine; locating the cutting spindle in the axis of the machine and supporting it from opposlte sides of the frame so that variations in temperature will not operate to displace said cutter; supporting the trunnion bridge or glmbal joint support for the pantograph or tracing lever at points near the cutting axis with opposite ends of said bridge secured in sllding connection with the frame, so that expansion and contraction due to variations in temperature may be compensated for without disturbing the relation between the cutter and blank; providing a simple and readily separable joint between the followers and the stylus or tracing end of the pantograph of a character to revent shake or lost motlon, to ermit rotatlon of the engaged follower or disk, and to maintain constant, in relation to the disk, the center of oscillation of the lever as its angular position is varied; providing a holder for the followers so disposed in relation to the platen or table and 4 pattern, that the followers may be removed and returned by the stylus; providing one of the two crossed axes ofthe universal joint supporting the pantograph or tracing lever with micrometer adjusting screw of such pitch that-the graduations of the scale employed read in units of the standard of measurement of the reduction or enlargement it regulates, to enable relative adjustments of said crossed axes to be quickly and accurately performed when setting the machine to vary one dimension ofthe ratio'betwee n the pattern and design to be cut; and the em ployment, in connection with the tracing lever and means for transmitting its motion to the work holder or cutter, of an ad'usting device for varying the ratio of re uction compared with the pattern, the same including an'adjusting device, suchas a screw and nut, adapted. to furnish direct readings on a scale in units of the standard of measurements adopted for the finished punches or matrices. v

The invention is intended more especially to provide a machine to make the steel punches used in the manufacturev of' type casting matrices. A convenient and preferred construction of a machine for this urpose embodying the invention will now e described by way of example with reference to the accompanying drawings, of which:

Figure 1 is a plan of the machine, Fig. 2 is a front elevation, and Fi 3 is a side elevation with parts removedl okingat the right hand of an observer of Figs. 1 and 2.

' Fig. 4 is a plan of the bed plate of the machine, Fig. 5 is a side elevation with parts in section of the upper part of the machine,

Fig. 6 is a front View, Fig.7 is a side view, each with parts in section, and Fig. 8 is a plan of the supporting and guiding members for the blank-holder, Fig. 9 is a perspective view of the blank-holder detached, and Fig. 10 isa top view'of the said holder in position, Fig. 11 is a vertical cross section, part in elevation, of the tool holder and its driving means. Fig. 12 is a bottom plan of the same, Figs. 13 and 14 are details of parts of the said holder, Fig. 15 is a plan, and Fig. 16 is an elevation of the levers for controlling the position of the tool holder, Fig. 17 is a side view partly in section of the micrometer screw controlling one of said levers, and Fig. 17" is a plan of the micrometer screw index-disk detached. Figs. 18, 19,

Fig. 28 is a sectional view of the follower carrier-table, Fig. 29 is a perspective viewof the stylus, or end of the tracing arm of the pantograph lever, Fig. .30 is a view on a greatly enlarged scale of a preferredform of tool, Fig. 31 is a viewof another form of tool, and Fig. 32 is a dia ammatic view to illustrate the manner 0 employing these tools. 7

Like reference signs indicate like parts in all the figures.

The frame of the machine comprises a bed plate A and a vertical standard bolted thereon, having two legs A A connected near the top by a cross bar A I Placed centrally in the bed late, in a recess extending. from front to ack thereof,

is an adjustable table C, secured to the bed plate by two studs C having milled heads so as to be turned by the operator without a A hole C is provided in the center of the table to receive for pur oses of adjustment the end or stylus B o? a pendent arm B of the operating or pantograph lever.

.When the machine is in operation a patcm D is located centrally on the table, as 7 shown in Fig. 4, and to position the pattern on the table and holdit in osition three are provided ;a slide C 1n front of the- B0 pattern and two slides C one on each side thereof. The rear wall of the openingin which the slides work furnishes a fixed gaglar project-1on0 adapted to engage as1mi-.

larly shaped notch D on the pattern'D, so that. by engaging the projection in thenotch" onthe pattern, the pattern is automatically placed 1n correct position sidewise-on the table. a plurality of plates provided, with projections variously located thereon, to enable the same pattern, with but onenotch thereon,

to be correctly positioned sidewise on the table, to cut punches of different sizes, for instance, for minion, brevier or pica, with the character properly located on the blank, that is in a definite position relative to one side of said blank.

Inasmuch as it is desirable that the shoul- 7 der or interval between the reduced end of the blank and one side of the latter should be uniform irrespective of the size of the punch cut and the amount of reduction, it is clear that if but one plate C" were provided this could not be'accomplished as the shoulder would vary in width proportional to the reduction and the character be wrongly positioned on the punch blank.

The slide C which has only alimited range of movement is pushed into position by hand'and readilylocked by means of a handle on a pin 0* rotatably carried in the table, and havin an eccentric portion 0 engaged in' a lug 5 projecting-from the underside of the slide into a recess in the table.

Each slide C is providtd with a stud C on its underside projecting downwardlythrough a slot C in the table, arranged to permit of sidewise-adjustment of the slide thereon, each stud having a butterfly nut so that the operator can readily release or clamp the slide as desired. I

A groove C may be provided on one side of the surface of the table adapted to receive the end I)? of a tee square'D having a handle D (see Figs. 26 and 27). The use of this tee square will be hereinafterexplained when the operation of the machine is described. j The bed plate A is formed with a p'rojecting lug at the backfofthe' pattern adjusting table havinga boss bored to" receive the pivot E (Figsi 3, '4 and '28) of a follower carrier-table 15* mounted thereon-and, hereinafter more fullydescr-ibedr The operating or pantograph lever "comprises "the pen-dent arm B, already referred The lower portionof the arInBjis preferably formedas a'hollow'tube B in""wliich isfl"engaged a telescoping portioni B jjnor- The plate 0? is made removable and,

vmally tendingto be pushed downwardly by a spring B, as shown in Fig. 2. The telescoping portion B terminating in the stylus :B be v ball-ended, as shown-clearly in F1g.-29.

re referred to, which, is preferably When the pointed end B of the arm B is placed in the hole C. of the table, the arm extends upwardly and backwardly to above the top 0 the frame standard, where it is formed integral with the cross-arm B extending horizontally across the machine g from back tofront, and supported at each end on a trunnion B these. trunnions being carried in opposite'ends of a yoke G, itself carried by trunnions G in lugs G? on a bridge or cross-piece G hereinafter called thetrunnion ,bridge, secured-by. studs G onto the top of the standards A Preferably the trunnioned bridge is provided at each end with atongue which fits into a corresponding groove in the end of each standardv leg, the studs G holding the bridge down in spring pressure so as to allow it to expand or contract with variations of temperature. The central portion of the 90, bridge is held rigidly in position by studs G" which fix it to a cross-plate H as here inafter described. All four trunnions are normally in the same plane, but preferably, as shown in the figures and hereinafter fully described, the support for the trunnions B in the yoke G are made adjustable fora purpose hereinafter describ'ed.

The arm B is desirably made as'light as is compatible with the rigidity required. As a convenient construction, combinin lightness with rigidity,-the arm may be provided with stays R secured to the lowerv portion of the arm and, tothe ends of a bracket R, bolted to a lug on the cross-arm 'B as shown in Figs. 1, 2 and 3.

' the holder for said punch being carried by one of said slides asfwill presently ap ear.

"By thus"securingfthecentral portion o f the bridge G supporting the tracing lever d1- rectly' to the cross-plate Ha pon which the slide fplates H Irareineumea and can necting' opposite'end s"of said bri'dgetfo the framebyslip joints, notion'ly isgthe strucfi' f e ren i d m is @1 Fi s? i ab e -f tb sp i e awet i sf i 'tib 's -bii lateral" displacement PM the tracing lever relative tothe, cutting ax s of'the'mchine "and {consequent variation in the ents I t 'av'o ee .33

The lower slide-plate H is supported and guided upon the slide cross-plate H, as best shown in Figs. 7 and 8, two slide ways being provided "opposite to each other. Preferably each slide way comprises two face pieces H", of hardened steel, secured by studs in a groove in the cross plate and contacting with a face piece H also of hardened steel, fixed on the slide plate H and with a guide piece H between them thus constraining the slide plate to move along one straight line in a horizontal plane. The face piece H projects slightly beyond the surface of the slide plate H4, so that the surfaces of the slide-plate and cross-plate are not in rubbing contact.

The upper slide-plate H is formed as a square plate with a central circular boss, extending upwardly through the opening in the trunnion bridge G and downwardly through openings in the lower slide plate H and the cross plate H as shown best in Fig. 5. The upper slide-plate is su ported on the lower slide-plate and guided iiy slide wa s H similarly arranged to those just be ore described, as shown best in Figs. 6 and 8, the face pieces being arranged so that the faces of the two slide plates are not in rubbing contact, the slide ways H constraining the upper slide plate to move at right angles to the pathof movement of the lower sllde late and in a plane parallel therewith. projection or hearing H is formed on the under face of the lower slide plate H below each slide way to take the weight of the upper slide plate.

To hold'the slide ways of the two slide plates and the cross plate in working contact a bottom plate H" is provided; screwed, as shown in Figs. 5 and 6, up to a shoulder on the boss of the upper slide-plate below the cross plate H To adjust the degree of contact of the horizontal bearing faces of the slide ways and to assist in relieving the lower slide plate of the weight of the upper slide plate, the bottom plate H is provided with four adjustable bearing pieces H preferably of hardened steel, one at each corner, whichcontact with corresponding bearing pieces H fast in the cross plate H The pieces H extend through the cross plate and contact with hearing pieces H in the upper slide plate H, these pieces extending down through suitable openings provided in the lower slide plate -H The pieces H", H are provided with a central hole H which acts as anoil duct for the bearing surfaces (see Figs. 6, 7 and 8.) As thus arranged slide plate H H receive independ-. ent support from cross plate H and 'atthe same time are constrained to move in parallel planes.

The upper portion of the boss of the upper slide plate H is bored out centrally to form a chamber H (Fig. 5) to receivethe universal joint or connection between the slide plates and cross-arm B of the panto raph lever. This connection includes a ball on the end of a short rod B wh ch rod passes up throughv a boss formed centrally on the cross-arm B of the lever B. Preferably, as shown in Fig. 5, a bushing B is provided in said boss to form the bearing for the rod.

The ball B works in bearing pieces B", carried in a sleeve B in the chamber H, the sleeve occupying only a portion of the depth of the chamber and being adapted to slide up and down therein. The bearing pieces are adjustably held in the sleeve by a screw-threaded washer B".

It is-evident that the extent of any movement given to the slides by a given movement of the lever pendent arm B willdepend on the distance at which the ball B" is positioned below the fulcrum of, said arm, that is the trunnions B G. To permit of varying the ratio of the movements of the slides and the arm, means are provided for setting the bearing of the ball B in any desired position in the chamber H and locking it in such position when set. A preferred construction is shown in the figures, see more particularly Figs. 5, 6 and 8.

The boss of the cross plece B is externally screw-threaded as at B, and an internally threaded nut or rin B provided to work thereon. Secured rlgidly on the upper end of the rod B say by a screw nut B is a cap B, of which the bottom edge is adapted to rest on the ring B x A bar B, Fig. 2, is fixed on the cross piece 13 adjacent to the r' B, and vided with a scale and the rlng is provided with an angular projection B also provided with a scale to act as a scale pointer, the scales indicating the ratio of movement given to the slide plates according to the position of the ring.

The screw B is so proportioned that the nut or ring B affords for the reduction ratio direct readings on the scalepf B in units which are those of the standard of measurement adapted for the, finished punches or matrices. Thus in practice the parts are so proportioned that when ring B is set to register with the zero mark on scale B the ratio of reduction as between the pattern end of the tracing lever and the slides H H controlled thereby is as 25 to l, and the scale is marked in both directions in units of .0001 of an inch, so that if the punch called for measures say .1277 the nut or ring B is turned until it registers with the corresponding degree upon the scale.

By adjusting the ring on the boss according to the scale and allowing the cap to rest thereon the ball B can be readily set by the I operator to obtain any desired ratio of movement of the blank relatively to the movement proof the pendent arm within the limits of ad justment permitted by the machine- To lock the ball bearing in position when w set, a suitable clamping device is provided,

the preferred form shown in Figs. 6 and 8, comprising a 'pin 13 having an eccentr1c ortlon B", the pin is mounted in a hole bored in the boss of the upper-slide-plate H,

' so that the hole opens into the chamber H except that portion holding the eccentric portion of the pin, which extends below said chamber. A handle B is provided to enable "the operator to partially rotate the pm and clamp the ball bearing within the chamber. When the ball bearing has been ositioned and locked the ring B is place out of contact with the cap B so that rod B is 1 free to reciprocate longitudlnally in its bearing in arm B of lever B as the latter swings on its pivots.

The descrl cluding the spherical joint and its radial connection with the tracing lever, possesses many advantages tending to preserve and maintain accurate relationship betweenthe tracer and the blank or cutter carried by or coupled with the slides, reducing the .num-

ber of joints to two, both located in aline- -ment with the axis of the tracing lever and provided with extended bearing surfaces, at the same time affording opportunity for varying the leverage or ratio of reduction by a single adjusting device, to wit, ring B.

It is necessary that the blank whose movements and position are determined by the tracing lever should occupy a central or predetermined position relatlve to the axis of said lever, and that such positioning may be automatically effected without special adustments being made each time the work is inserted the following arrangement has been adopted. A blank holder J Figs. 9 and 10 6 and 10') formed in the lower end'of theboss of the upper slideplate H, and is adapted to slide endwise therein, whileheld from vertical movement relatively thereto by one side of the holder-and one side J of the recess being shaped as partsof a dovetail, a s' shown in Figs. 6, 9and 10'. The

holder is positioned-endwise-in the recess by y a flatfon' the head J of astud positioned I holder.

handling by the operator, as it is desirable in theslide plateto engage one endof the" the holder may. .be

Convenientl provided with a hand e J for convenience in in a wall of the recess J bed means fortransmitting 11 10' .tion from the tracing lever to the slides, in-

To look the holder in 'osition in the i cess J a catch is provi ed. 'A preferred construction isshown in Figs.' 6, 7 and; '10,"

comprising a bolt. J positioned: obliquely? and formin an easy'working' fit in a. hole One end of the bolt J 7 when in its uppermost position, is

adapted to engage in a hole J 8 in theholder, but owing toits oblique position it is normally held free thereof by gravity, the other end of the bolt when in this position resting on a flat. spring J". To place the bolt in looking position a forked arm J provided with a handle, ispivoted at J in a recess in the slide plate so as to straddle the spring J". The arm J has a cross roll J in its fork adapted to engage the flat spring and press. it forwardly to place the bolt looking position when the arm J is in a raised position, as shown in Figs. 2 and 10, "the cross roll being free of the spring, allowing the bolt to return to inoperative osition, when the arm is in its lowered posltion, as shown in Figs. 6 and 7. To hold the arm J in its raised or looking position a catch J .is provided which engages the end of the arm fork when the arm is in its raised position. The catch is pivoted at J in a bracket on the underside of the bottom plate H, and controlled by a spring J To lock the holder J in position, the operator has only to raise the arm J which pushes back the catch against the tension of the spring J until .the end of the fork has passed the notch of the catch, when the spring pushing the catch forward locks the arm. To unlock the bolt, the operator has only to push back the catch and the arm falls by gravity, releasin the flat s ring J 9 whereupon the boltJ' rops out'o position.

As shown in the figures, the spring bolt J 7 is so arranged that when in operative position, it presses the holder'simultaneously against the three fixed portions of its carrier viz :the'pin J the upper wall J ",of the recess J and the oblique wall J of said recess. The cutting is performed by a "rotary tool fixed in a holder the latter detachably applied to a hollow spindle mountved to rotate in a holder or quill detachably mounted in the frame.

The quill or holder for the cutting tool K is carried in a vertical hole formed centrall in the standard cross-piece A3, the hole pre erably being bushed, as shown at'A, Fig. 11. It is necessary for the quill to be so arrangedthat the tool-may be rapidly rotated approximately from 5000 to 6000revolutions per minute and also-readily adjusted end'-. "wise andremovable to give varying depths of out and for the purposeflof changin the -too l. A preferred construction is as fol ows:

Referring more particularly to Figs. 11

' ried within the sleeve on two ball bearings positioning piece K and is secure K K respectively, adjustable by means of a sleeve K the osition of which is controlled by the mil ed nut K, screwed on to a reduced portion of the spindle K Carried within the revolving spindle K is a tool-holder K in which the tool is held, shown detached in Fig. 14. The upper part of the tool-holder is bored out to receive the tool the lower part of the hole being enlarged and screw-threaded to receive a positioning piece K (shown detached in Fig. 13). The tool is placed in the holder restin on the therein and held from turning by means of a set screw K.

The upper end of the holder is flared out in acone shape, as shown at K, being adapted to fit into a corresponding conical surface on the end of the spindle K while its lower end is screw-threaded to engage in a member, K, contained within and projecting beyond the lower end of the spindle K By meansof this member the holder is positioned in the quill under spring pressure, the cone K of the holder being held in contact with the conical surface of the spindle by a spring K held between a collar K on the member K and the end of an enlarged portion of the spindle bore within which the spring is positioned. 1

The tool holder does not engage the bor of the spindle throughout its length, but is provided with a cylindrical bearing surface K projecting from the holder ata point remote-from the cone, as shown clearl in Figs. 11 and 14. The holder isheld om rotation in the spindle as b means of a stud K screwed in the spind e, while its end engages in a slot K in the holder. As shown clearly in Fig. 14, while preventing rotation of the holder in the spindle, the

slot is so arranged as not to interfere with endwise movement of the spindle in an upward direction, and does not therefore interfere with its removal therefrom. By unscrewing the member K? so as to detach it from the holder (the member being provided with a hand-wheel K for this purpose),

- and pressing the member up against the action of its s ring, the coned head of the holder is us ed free of the spindle, so as to be readl grasped by the fingers, and the holder can e withdrawn. A series of holders each having its tool in position is provided, as is hereinafter more fully set forth when the operation of the machine is described. I

By the construction above described, a holder can be removed from the spindle and re laced therein, or another holder sub 'St tute therefor without removal of the spindle from its bearings or disturbance of a constant relation between the cutting portion of each and any tool of the spindle.

The conical head K of the tool holder and the tool held therein'are relatively so proportioned and positioned that the base of the cone is not farther from the tip of the tool K when secured therein than a radius of the cone base, and, as shown in the figures, the apexof the cone is directed away from the tip, so that thrust exerted on the cutting tool serves only to bed the cone more perfectly in its bearing in the spindle.

The spindle K is rotated by a pulley L driven from any convenient source of power. A convenient construction and arrangement of parts for mounting the pulley are shown in. Figs. 11 and 12.

A plate L is secured by screw studs "the underside of the standar cross-piece A from which it is insulated by a layer A" of material'which is a non-conductor of heat. On to this plate is secured a pulley bracket comprising a segmental plate L secured by studson to the plate L supporting a ring L through which the lower end of the spindle K passes. The outer surface of the ring is provided with a circumferential groove L, which forms one wall of a ball race, of which the other wall is formed-bytwo rings L L carried within the body of the pulley L which is hollowed out, as shown in Fi 11. For purposes of construction and adjustment, the ring L is carried in an externally screw-threadedring L screwed into the pulley; a screw-threaded locking ring L may also be provided as shown. The'pulley is provided with two oppositely placed ears L L adapted to engage a crossar L having a central hollow boss by which it is removabl secured onthe end of the revolving spin le K ,say by screw threads L Conveniently the cross-bar boss may be provided with a hand-wheel L The orifice of the ring L is greater in uill so-that the quill can be readily removed rom the machine, without disturbance of the bolt end engaging said sleeve being formed with a concave curve to correspond with the curve of said surface, as shown best in Fig. 15, a hole to receive said bolt being formed in the cross-piece A and bushing A". tional contact with the holder by spring diameter than the outer sleeve K of the.

The bolt M is normally held in fricpressure, and thus besides preventing the quill from turning, holds the same rigidly againstone side of its bearing with a constant pressure.- The bolt is adapted to be released at will'by the operator; a preferred construction comprises a horizontal lever M pivoted at M in the cross-piece A One end of the lever M is engaged in a slot M in the bolt M, the other end of the lever being engaged by a pin M, spring-controlled so as to normally press the head of the bolt M against the sleeve K To enable the bolt M to be readily thrown and held out of action when the operator wishes to remove the tool-holder, a vertical rod M (see Figs. 2 and 3) is provided having its lower end pivoted to the bed-plate A and its upper end in a lug A on the standard A. Fixed on the upper end of the rod M, which projects just above the lug, is a nut M, having a cam surface M so shaped that a partial rotation of the rod M from the normal position shown in Fig. 15 will rock the lever against the tension of the spring-pin M and release the holder, the cam surface being so shaped, as shown in Fig. 15, that the 'bolt M will remain in inoperative position until the rod M is returned by the operator to its normal position. To allow the operator to rotate the rod, an arm with a handle M is fixed on the rod just above the bedplate A adjacent to the pattern-carrying table, as best shown in Fig. 2.

A11 adjustable stop is provided to fix the position vertically of the tool-holder, 'to provide for different depths of cut. Preferably this takes the form of a lever, of which one end is in contact with the top of the quill, the position of the lever being controlled by a micrometer screw. The construction illustrated is best shown in Figs. 15, 16 and 17.

A lever N is pivoted, intermediate its ends, between ears 'A on a pin A carried in a hole in a lug on the standard crossebar A One end of the lever rests on the top .of the outer sleeve K of the quill being held in contact therewith by a spring N Conveniently the spring is housed in a hole A in the standard cross bar, one end of the spring being carried by a pin in a slot N in the lever N, while its other end is 'fastened to the cross-bar. The other end of the lever N rests on the top of a micrometer screw N 3 carriedin a lug A on the standard leg A. Each end of the lever is shaped'so' as to have a knife-edged or other line bearing on the quill and the screw respectively, so as'to tendto isolate the micrometer from the heat-generating cutter and blank and from the bearings of the tool operating spindle, in order to prevent their-heat from aflectmg its accuracy. Other heat-intercepting constructions may be employed.'

The micrometer screw is of known. con

required, and the upper side of the drum is provided with a stop N which engages a pin N on an arm N secured by studs on to. the lug A The readings of the drum are taken from a mark on the front of the index finger N. The graduations on the drum, however, are only intended to be used when some special punch is to be cut. For standard sizes'of punches, or for those of which a number are to be prepared, the following arrangements are preferred, as renderin the operation more automatic and elimmating'the chance of personal error by the operator. A disk N shown detached in Fig. 17*, provided with notches N around its-periphery, is secured on the end of the micrometer screw beneath the drum in such a manner asto be readily fixed in position thereon and removed therefrom; a convenient arrangement is shown in Fig. 17 in which the disk is secured on the end of the screw stem by a knurled nut N being located as to position and prevented from turning except with the screw stem by engagement with a pin N which, as shown in Fig. 17, may be a prolongation of the stop N. The notches N which are munbered as shown in Fig. 17*, are adapted to engage with a spring pin Nf, carried in the standard leg A. One of these disks N is prepared for each standard size of punch, and the notches, when engaged with the pin N indicate the successive positions required to be given to the micrometer screw to rightly position the cutter for the various cuts or stages iii shaping the punch.

To enable the operator while placed in convenient position for manipulating the machine, to readily read the scale on the. under side of the disk, a mirror N is provided, fixed, as shown in Figs. 3 and 17, on the standard A the' numbers being reversed, as shown in Fig. 17*, so as to appear in normal position in the mirror.

Means are provided to hold up the quill against the tension of the spring N so that the end of the lever N is in contact with the head of the micrometer screw when the tool has completed a cut.

A preferred construction comprises what may be called a countering lever O pivoted at O (Figs. 15, l6'and 18 to 22)., intermediate of its ends, in a slot in the standard crossbar. In one end of the lever is a pin O with a milled head, for purposes of manipulation, the end of the pin engaging the bottom of thequill K tending to raise the same i againstthe tension of the micrometer-lever spring N. The other end of the lever is fixed to an arm Fig. 2, which passes down in front of the standard leg A to near thev base plate A, where it is held in frictional contact with a bar 0 fixed on the standard leg. The arm is provided with a handle 0 for manipulation purposes. The lever O is provided, intermediate its pivot and the arm with a pin 0, controlled by the tension of a spring 0" to cause the lever to normally put upward pressure on the quill suflicient to overcome the tension of the micrometer-screw lever spring N Since it is desirable that the lever should be readily adjustable to relieve the quill of such ressure, a catch is rovided for the pin 6 to hold the pin against the tension of 1ts spring when the lever is placed out of operative position. A preferred construction is shown in Figs. 18, 19,20 and 21. The pm 0 and its spring are housed in a lug O on the lever O. The pin is provided with a notch O with which the nose 0 of a catch lever 0 pivoted at O in a slot in the lug, is

adapted to enga e b the tension of a s rin O, as shown in Fig. 19, the slot and datch nose being so positioned as to be in engagement when the lever is in inoperative position, as shown in that Fig. 19.

To release the pin 0 when it is desired to replace the lever in operative position, a short pin'O is seated in the lug so as to move endwise therein, and provided with a pin 0 engaged in a slot 0 in the spring pin 0. The pin 0 has an inclined cam surface 0" in engagement with a pin 0 on the catch lever.

When the lever is in operative position, as shown in Figs. 2 and 18, the pin 0 being engaged with the sleeve K holding the quill in raised position with the ends of the lever N engaged respectively with the micrometer screw and the top of the quill, the pin 0 is engaged with the frame of the machine, the catch 0 being below the notch 0 and the arm 0 in position, as shown in Fig. 2. If now the operator desires to release the quill, he moves the arm 0 to-- ward the left to the median. position marked on the bar 0, thereby pressing down the pin 0 into the position-shown inFig. 19; when the catch 0 engaging the notch 0 the spring 0 is rendered inoperative and the lever 0 remains in-inoperative position.

To. release the pin when the lever O is again put into operative position, the .operator moves the arm'O still farther toward the left (looking at Fig. 2) bringing the pin 0 into the position shown in Fig. 20. During this latter movement the pin 0 is also pressed down, so that its cam surface 0 engagin the lever pin 0 pulls back the catch' an releases the pin 0. On moving the arm 0 now toward the right' the pin 0 under the influence of its spring returns to operative position. Owing to the relative position of the pin 0 and a slot 0 as shown inthe figures, the pin 0 does not move upwardly until the notch O of the pin 0 has passed the catch 0.

By means of the lever M, arm M and handle M the quill can be readily adjusted and locked from the level of the platen in the immediate vicinity of the pattern, while the lever 0, arm 0 and handle 0 provide m ns operated from the immediate neighbo rliood of the pattern for moving the cutter in the direction of the axis of the cutting spindle to or from the work.

From the construction hereinbefore described it is evident that any movement of the stylus B of the arm B around the cen-v ter 'of the table 0 will be communicated on afreduced scale to .the punch blank J around the rotatable tool, the ratio of said reduction depending on the position of the ball joint B relative to the trunnions B G and that this position can be varied by raising or lowerin the ball joint in the chamber H If, t erefore, a pattern, such as D (Fig. 4) be arranged on the table and the stylus .B moved around it, approaching step by step to the design thereon until it follows the exact outline of saiddesign, each movement will have brought the blank J in the work holder in corresponding contact with the rotating tool; removing out after out of metal from its surface until an exact reproduction of the design on the predetermined reduced scale wil have been formed thereon. In order to regulate, automatically the movements of the armoint about the pattern at different stages 0 adjustment to produce the desired taper for a unch', a series of pattern followers are -pre erably provided formed as disks, and carried centrallyon the stylus B the periphery of the disks bein caused by the operator to follow the outline of the attern as closel as the size of the disk will allow. Oneo the disks E is shown detached in Figs. 23 and 24, E being the surface applied to the pattern outline and E a central boss having a conical hole E to receive the ball-ended stylus B, the conical holes being so sha ed and proportioned relatively to the bal end of the stylus that the center of the ball is always in line with the upper surface of the follower. The disks aduallylessen indiameter, as shown in Fig. 4, until the last eniployed followers of the series become sha 'ed as shown in Fig. 25,, comprising a body E with hole E and a dependent point which forms the surface E to contact with the pat tern outline. -This dependent point terminates preferably as a sphere, of which the bottom is flattened, the center of the s here 'being on a line with the top edge 0 the pattern. "By this construction the axis of the tracer is at a uniform distance from the 

